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首页> 外文期刊>Advanced Functional Materials >Biphase Cobalt-Manganese Oxide with High Capacity and Rate Performance for Aqueous Sodium-Ion Electrochemical Energy Storage
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Biphase Cobalt-Manganese Oxide with High Capacity and Rate Performance for Aqueous Sodium-Ion Electrochemical Energy Storage

机译：高容量和高倍率性能的水合钠离子电化学水的双相钴锰氧化物

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摘要

Manganese-based metal oxide electrode materials are of great importance in electrochemical energy storage for their favorable redox behavior, low cost, and environmental friendliness. However, their storage capacity and cycle life in aqueous Na-ion electrolytes is not satisfactory. Herein, the development of a biphase cobalt-manganese oxide (Co-Mn-O) nanostructured electrode material is reported, comprised of a layered MnO2 center dot H2O birnessite phase and a (Co(0.83)Mn(0.13)Va(0.04))(tetra)(Co0.38Mn1.62)(octa)O-3.72 (Va: vacancy; tetra: tetrahedral sites; octa: octahedral sites) spinel phase, verified by neutron total scattering and pair distribution function analyses. The biphase Co-Mn-O material demonstrates an excellent storage capacity toward Na-ions in an aqueous electrolyte (121 mA h g(-1) at a scan rate of 1 mV s(-1) in the half-cell and 81 mA h g(-1) at a current density of 2 A g(-1) after 5000 cycles in full-cells), as well as high rate performance (57 mA h g(-1) a rate of 360 C). Electrokinetic analysis and in situ X-ray diffraction measurements further confirm that the synergistic interaction between the spinel and layered phases, as well as the vacancy of the tetrahedral sites of spinel phase, contribute to the improved capacity and rate performance of the Co-Mn-O material by facilitating both diffusion-limited redox and capacitive charge storage processes.
机译：锰基金属氧化物电极材料因其良好的氧化还原性能，低成本和环境友好性而在电化学储能中非常重要。然而，它们在含水钠离子电解质中的储存容量和循环寿命并不令人满意。本文报道了双相钴锰氧化物（Co-Mn-O）纳米结构电极材料的开发，该材料由层状MnO2中心点H2O水钠锰矿相和（Co（0.83）Mn（0.13）Va（0.04））组成（tetra）（Co0.38Mn1.62）（octa）O-3.72（Va：空位; tetra：四面体位点; octa：八面体位点）尖晶石相，通过中子总散射和成对分布函数分析验证。双相Co-Mn-O材料在水性电解质（121 mA hg（-1），半电池中的扫描速率为1 mV s（-1）和81 mA hg的情况下，对Na离子具有出色的存储能力（-1）在全电池中经过5000次循环后的电流密度为2 A g（-1）），以及高倍率性能（57 mA hg（-1）时的360 C速度）。电动分析和原位X射线衍射测量进一步证实，尖晶石相和层状相之间的协同相互作用以及尖晶石相的四面体位点的空位有助于提高Co-Mn-通过促进扩散受限的氧化还原和电容性电荷存储过程来形成材料。

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